"Upon this Rock I will built my Church"
Did not Christ himself declare Simon, Peter, which means rock?
Did not God himself instruct Moses to strike the "rock" to refresh the people of Israel? Twice?
Looks like that Church was quite literally built on top of that "Rock"
I mentioned in an earlier post that... "The debate concerning the primacy of Peter is endless and will not be resolved on FreeRepublic". I still believe that. However, I am not sure what relevence your post has to whether or not "he who is not with the Pope is not with God, and who desires to be with God must be with the Pope." Could you explain what you mean?